 <div id="sign1" ng-controller="Sign1Controller">
     <div class="sign1_mask ">
         <div class="sign1_box">
             <div id="btn"  style="background: #f5003a;width: 200px;height: 50px;margin: 20 auto;">
                     点击
             </div>
         </div>
     </div>

 </div>